1985

8.0

2018

7.3

2020

3.5

2005

7.1

1988

7.8

1997

7.1

1972

7.8

1984

7.5

1994

7.4

1939

7.6

1967

7.7

1968

7.1

2000

6.9

2023

7.0

2021

6.8

1976

6.5

1999

7.1

1982

8.1

2006

8.2

2022

6.3